[解析]
13.A 14.C 15.B听第12段对话,回答第13至15小题。
W:How did you spend the weekend,John?
M:Let me see.On Saturday afternoon I was in my brother's shop.On Sunday,I stayed at home.
W:What did you do in your brother's shop?
M:I helped my brother.
W:What did you do at home on Sunday?
M:I finished my homework after breakfast.Then I cleaned my room.
W:Do you often clean your room?
M:No.I clean my room once a week.